Draft regulator



J. L. BREESE Dec. 21, 1937.

DRAFT REGULATOR Filed Feb. 19, 1937 Patented Dec. 21,193? I z,1oz,884.

UNITED sTA'ri-:s PATENT, oFFicnf .James L. Breese, Santa Fe, N. Mex. Application February 19, 1937, Serial No. 126,571

2Claims.

My invention relates to an improvement in control dampers for use, for example, with oil burners. i

One purpose is the provision of a damper for 'controlling the infipw of atmospheric air to a ilue.

Another purpose is to render such infiow automatically responsive to variations of temperature adjacent the valve member of the damper.

Another purpose is the provision of an improved thermostatically Operating damper member.

Another p'urpose is the provision of such a damper member 'which has a thermostatic control mounted on and movable with the valve member of the damper itself.

Other purposes will appear from time to time in the course of the specification and claims.

I illustrate my invention more or less diagrammatically in the accompanying drawing wherein:

Figure 1 is a side elevation;

Figure 2 is a section on the line 2-2 of Figure 1; and

Figure 3 is a partial section on the line 2 ,2 of Figure 1 on an en'larged scale, illustrating the parts in slightly different position.

Like parts are indicated by like symbols throughout the specification and drawing.

Referring to the drawing, I generally indicates any suitable fiue pipe or chimney which will be understood to extend upwardly or outwardly from any, suitable combustion zone such' as an oil burner, stove, or the like. Associated therewith is a ylaterally extending stub passage 2, the end of which is surrounded by a ring 3 herein shown as having an inwardly extending oircumferential flange 4. The space within the aperture defined by said flange is normally enclosed, for example, by the valve member' 5, herein shown as provided with any suitable pin 6, the ends of which are received inl bearings 1,) 8 at opposite sides of the flange 4. 9 is any suitable stop or projection associated with the flange 4' of which is secured as at 3 to the valve 5. The

valve 5 may be cut away as at |44 -to conform generally to the contour of the Weight IO. It will be understood that the weight Ill tends gravitally to resist opening of the valve 5 when the pressures in the flue are below atmospheric.

' shown in Figure 3 and atmospheric air is allowed to pour into the' flue.7 The' baling or-resisting effect of the weight IO is varied in response -to 6 changes of heat conditions .in the fiue. Assuming there is an increase in heat, the strip |2 may flex from the position in which it is shown in Figure 2 to the position in which it is shown in Figure 3, thereby moving the weight IO inwardly 10 in relation to the valve 5 and redueing its tendency to hold the valve in closed position. This provides a deflnite increase in the flow of air allowed through the stub 2 into the flue and thus a decrease of draft up the flue and therefore ll a decrease of air inflow or air supply to the zone of combustion. As the temperature in the fiue I drops, Ithe strip |2 flexes in the opposite direction and the weight, IO becomes increasingly effective in closing the valve 5. The weight may 20 4 without departing from the spirit of the invention and I wish, therefore, that my showing be taken as in a sense diagrammatic.

For instance, the shape of the strip |2 may be widely varied. Where I describethe strip in the claims as a thermostatic strip, it will be understood that I mean a strip or member which fiexes, or changes its shape or position in such fashion 35 as to move the weight at its free end. It will be understood, of course, that the feature of adjusting the Weight, while normally useful, may be dispensed with if desired.

I claim: i

1. An automatic draft regulatorfor' ducts or the like which includes an inlet member adapted to communicate with vsaid duet, a valve member pivoted in said inlet member and adapted when in one position substantially to close the Vinlet 45 thereof, a thermostatic strip secured at one end to said valve member and a weight supported on the free end of said strip, said thermostatic strip lying closely adjacent the inner face of said valve member and being adapted to respond to changes 50 in temperature within said duct and thereby. to move said weight in relation to said pivoted valve member. i

2. An automatic draft regulator for ducts or the like which includes an inlet member adapted 55 to communicate with said duet, a valve membez` ing constantly exposed to temperature condipivoted in said inlet member .and adapted when tions within said duet, and being adapted thereby -in one position substantially to close the inlet to move said weight in relation to said plvoted thereof, a thermostatic strip secured at one end valve member, in response to temperature to said valve member and a weight supported on changes within said duct.

the free end of said strip, said thermostatic strip being positioned within the in'let member and be- JAMES L. BREESE. 

